<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Base</title>
</head>
<body>
    {% block header %} <h3>Unnamed</h3> {% endblock %}
    {% block body %} <div>No body</div> {% endblock %}
    {% block footer %} <div>Copyright © 2018 Horace</div> {% endblock %}
</body>
</html>